Marine-engine governor



June 10 1924.

T- JACKSON IARINB ENGINE eovanuon Filed Jan. 11. 1921 1 I, ////I/I/l I/YWENTJIYI 07% m WM Patented June 10, 1924.

UNITED STATES PATENT OFFICE.

THOMAS JACKSON, OF LEWISHAM, LONDON, ENGLAND, ASSIGNOR T0 ALLAN RAMSAY, OF IEOLKES'IONE ENGLAND.

MARINE-ENGINE GOVERNOR.

Application filed January 11, 1921. Serial No. 436,422.

To all whom it may concern:

Be it known that THOMAS JACKSON, sub ject of the King of Great Britain and Ireland, residin at 27 Mount Pleasant Road. Lewisham, fiondon, S. 15., England, has invented new and useful Improvements in Marine-Engine Governors, of which the fol lowing is a specification.

This invention relates to improvements in marine engine governors and is an improvement in or modification of the arrangement described and claimed in the specification of Letters Patent of the United States of America issued to me under No. 1,413,586.

The invention has for its object the provision of means whereby greater efliciency of operation and a. wider range of antic ipatory action is obtained, in the manner hereinafter described.

The arrangements described in the specification hereinbefore referred to, provide for the operation of the throttle, to out OH or reduce the flow of motive fluid to the engine, when the stern of the vessel, during pitching, has passed upwards through a predetermined amount, and to permit or increase the flow when the stern has passed downwards a certain amount.

Owing to the construction of this device the necessary movement of the stern downwards for effective operation materially exceeds the necessary movement upwards and as a consequence the anticipatory efi'ect is considerably reduced.

This invention consists in the modification of the contour of the path on the tiltable control element so that the mobile gravity controlled body is influenced to a substantially similar degree by similar u ward and downward movements of tl ie stern.

In order that this invention may be the better understood we will now proceed to describe the same in relation to the accompanying drawing reference being had to the letters and figures marked thereon; like letters refer to like parts in the various figures in which Fig. 1 diagrammatically illustrates the position of the various parts when the water line of the hull is horizontal or in normal relation to the surfaces of the surrounding water.

Fig-n2 diagrammatically illustrates the position of the various parts when the hull rises by the stern.

Fig. 3 is a detail view of the tiltable control element drawn to a larger scale for the sake of olearness.

Referring to the drawing a is the tiltable control elemnt which pivoted at b on the plate (3 which has a valve seat (1 adapted to co-operate with the valve e carried by the element a. The plate 0 has inlet and outlet orifices and is provided with a rover f having lugs g. The element a has a mobile gravity controlled element h mounted thereon in such manner that free movement within the limits of the cover f is possible. The parts enumerated are Sim-- ilar to and function in an analogous way to the equivalent part described in the specification No. 1,413,586 hereinbefore referred to with the difference that the element at is curved in the present instance instead of being straight.

Fig. 3 shows on a larger scale the element a and the dimension 5 represents the flexure of the element said dimension i being situated in the plane containing the axis In or between the plane containing the axis In and the plane containing the end Z of the member a.

in operation the tangent of the stern end of the member a will, when the Vessel is in normal position. be below the horizontal a small angle to ensure stability of the mobile gravity controlled element.

\Vhen the stern of the vessel rises the member a will first pass through the small angle necessary for stability and then through an angle which is equal to the angle of repose. The mobile gravity controlled element will now be free to roll and in rolling after passing through the plane containing the axis A: will depress the meml (-1- a and open the valve 6. The inclination of the keel to the horizontal at this position introduces a predetermined point of substantially unique location for the stern.

To ensure operation of the overnor under reverse condition, when t e stern has reached the position of substantially unique location, the tangent of the head end of the element a should theoretically be at the angle of repose above the horizontal. In practice this is impossible however, as it would seriously impair the required certainty of movement of the mobile gravity controIE-de'leinent which obviously would not be'i'n static equilibrium 'after its movement due to the stern having passed upwards and as the angle of repose is very small indeed, it can be ignored or compromised with safety.

It has been found that if the dimension 3' (Fig. 3) is equal to twelve one thousandths of an inch when the length of the member a is five inches that sufficient movement for ellicient valve operation is provided and all practical requirements are met.

The invention may be usefully put into effect by bending the tiltable control element at or b varying the cross section of the channel, forming the path for the mobile body, in the said tiltable control element a but it must be understood that We do not limit ourselves to these arrangements which are by Way of example only.

I claim:

In a governor for marine engines in which a power device operates the throttle and is controlled by a pivoted gravity contrelted Parke device with is rolling element lo-ated in a dlosed casing having an inlet and outlet for fluid pressure, said closed casing being pivoted to 4% fixed support on the ship and having adjustable means by which the casing can be a-ngularly displaced to any position relative to the keel of the ship the combination of a curved track on said pivoted gravity controlled valve device for the rolling element so proportioned as to cause said element to he angularly displaced to the same extent by said rolling element at a iredetermined point of sub stnntially unique location in the ascending and descending movements of the stern when said rolling element is on either one or other Side Ol the pivot.

In testimony whereof I have signed my name "to this specification in the presence of two subscribing Witnesses.

THOMAS JACKSQN.

Witnesses k Flooxn (QRAB'VILT'ZE WRm'HT, FRANK SYDNEY HEIMS. 

